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/*
* (C) Copyright 2009-2011 -
* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* LTTng vTID context.
*
* Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "ltt-events.h"
#include "wrapper/ringbuffer/frontend_types.h"
#include "wrapper/vmalloc.h"
#include "ltt-tracer.h"
static
size_t vtid_get_size(size_t offset)
{
size_t size = 0;
size += lib_ring_buffer_align(offset, ltt_alignof(pid_t));
size += sizeof(pid_t);
return size;
}
static
void vtid_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct ltt_channel *chan)
{
pid_t vtid;
/*
* nsproxy can be NULL when scheduled out of exit.
*/
if (!current->nsproxy)
vtid = 0;
else
vtid = task_pid_vnr(current);
lib_ring_buffer_align_ctx(ctx, ltt_alignof(vtid));
chan->ops->event_write(ctx, &vtid, sizeof(vtid));
}
int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
{
struct lttng_ctx_field *field;
field = lttng_append_context(ctx);
if (!field)
return -ENOMEM;
if (lttng_find_context(*ctx, "vtid")) {
lttng_remove_context_field(ctx, field);
return -EEXIST;
}
field->event_field.name = "vtid";
field->event_field.type.atype = atype_integer;
field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT;
field->event_field.type.u.basic.integer.alignment = ltt_alignof(pid_t) * CHAR_BIT;
field->event_field.type.u.basic.integer.signedness = is_signed_type(pid_t);
field->event_field.type.u.basic.integer.reverse_byte_order = 0;
field->event_field.type.u.basic.integer.base = 10;
field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
field->get_size = vtid_get_size;
field->record = vtid_record;
wrapper_vmalloc_sync_all();
return 0;
}
EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx);
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Linux Trace Toolkit vTID Context");
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